WI0400198_Monitoring (Report)_20230711

Mr. Michael Rogers
UIC Program Manager
NCDEQ — DWR
1636 Mail Service Center
Raleigh, North Carolina 27699
Subject.
1 st Semi -Annual Groundwater Monitoring Report — 2023
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, North Carolina 27103
Incident Number: 6400 (Closed)
Risk Classification: Low (No Further Action)
Dear Mr. Rogers:
ARICADIS
Arcadis U.S., Inc.
111-C Sanders Lane
Bluefield, VA 24605
Tel [phone]
Fax [phone]
www.arcadis.com
ENVIRONMENT
Date:
July 11, 2023
Contact:
On behalf of Atlantic Richfield Company (ARCO), a BP Products North America,
Inc. (BP) affiliated company, Arcadis G&M of North Carolina is submitting the Hardik Patel
attached 1 st Semi -Annual Groundwater Monitoring Report — 2023 for the above
referenced site.
Phone:
Please contact me at [phone] with any questions or concerns related to
the Report or this incident number. 919.328.5605
Sincerely,
Arcadis G&M of North Carolina, Inc.
J16f4dv &�,
Hardik Patel
AFS Project Manager
Copies:
File — BP #24163
Email:
[e-mail]
Our ref:
30143397

ARCADIS
Atlantic Richfield Company
c/o BP Products North America, Inc.
1ST SEMI-ANNUAL MONITORING
REPORT - 2023
Former BP Facility #24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
NCDEQ Incident #6400 (Closed)
Injection Permit #W10400198
July 2023

111 Semi -Annual Monitoring Report — 2023
g"-Jv- /w
Hardik Patel
RPFS Project Manager
C. Scott Bostian, P.E.
North Carolina P.E. No. 25659
Senior Engineer
1 ST SEMI-ANNUAL
MONITORING REPORT
-2023
Prepared for:
Atlantic Richfield Company
= BP Products North America, Inc.
Mr. Jim Smith — Project Manager
201 Helios Way
Helios Plaza — 611' floor
Houston, TX 77079
Tel 832,619.3585
Prepared by:
Arcadis G&M of North Carolina, ]no.
5420 Wade Park Blvd.
Suite 350
Raleigh, North Carolina 27607
Tel [phone]
Fax [phone]
www.afG2id15-os.com
Environmental
Our Ref.:
30143397
Date:
June 22, 2023
This document is intended only for the use of
the individual or entity for which it was
prepared and may contain informafion that is
privileged, confidential and exempt from
disclosure under applicable law, Any
dissemination, distribution or copying of this
document is strictly prohibited.
arcadis.com
ES-1

111 Semi -Annual Monitoring Report -- 2023
1" Semi -Annual Monitoring Report — 2023
Former BP Facility #24163
381 Knollwood St
Winston-Salem, Forsyth County. North Carolina
Latitude 361, 5' 25.94"N Longitude 800 17' 11.79"W
(Reference Figure 1 }
Groundwater Incident #: 6400 (Closed)
Risk Classification:
Reason for Risk Classification:
Land Use Category:
Source of Release:
Date of Release Discovery:
Estimated Quantity of Release:
Cause of Release:
Responsible Party:
Property Owner:
Low (No Further Action)
Dissolved -phase Sulfate
concentrations above
groundwater quality standards
(2L)
Industrial/Commercial
Former gasoline UST system(s)
1983
Unknown
Former UST System
Atlantic Richfield Company
cio BP Products North America,
Inc.
Attn: Jim Smith
201 Helios Way
Helios Plaza — 61". Floor
Houston, TX 77079
(832)-619-3585
Mr, Charles Sherren
Thruway Shopping Center, LLC.
7501 Wisconsin Ave., Suite 1500
Bethesda, Maryland, 20814
[phone] ext. 215
`,,ttt 511111111r1
a Professional Engineer for Arcadis G&M of North
Carolina,: nc -* certify that t? e information contained in this report is correct and accurate to the best of
my knovijedge. Arm G&M df North Carolina, Inc. is licensed to practice geology and engineering in
North CjrolMa. Tt9 WaWication nirnbers of the company are C-155 (geology) and C-1869 (engineering).
f��ll11�111ttt
arcadis.cam ES-2

1 st Semi -Annual Monitoring Report — 2023
CONTENTS
1.0 Site History and Characterization
2.0 Groundwater Monitoring ..............
2.1 Groundwater Gauging ..............
2.2 Groundwater Sampling .............
2.3 Groundwater Analytical Results
3.0 Site Remediation
3.1 Remediation Activities to Date
4.0 Conclusions and Recommendations
TABLES
Table 1. Monitoring Well Construction Data
Table 2. Groundwater Elevation Data
Table 3. Summary of Groundwater Analytical Data
FIGURES
Figure 1. Site Location Map
Figure 2. Site Map
Figure 3. Potentiometric Surface Map — June 8, 2023
Figure 4. Groundwater Analytical Data — June 8, 2023
Figure 5. Sulfate Isoconcentration Map — June 8, 2023
A — Historical Groundwater Elevation Data
B — Laboratory Analytical Report and Chain -of -Custody Record — June 13, 2023
C — Historical Groundwater Analytical Data
5
6
6
6
7
7
7
8
arcadis.com ES-3

1 st Semi -Annual Monitoring Report — 2023
EXECUTIVE
On behalf of Atlantic Richfield Company (ARCO), a BP Products North America, Inc. (BP) affiliated
company, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel performed the semi-annual
groundwater sampling of groundwater monitoring wells associated with Former BP Facility #24163 located
at 381 Knollwood Street, in Winston-Salem, Forsyth County, North Carolina (the Site) on June 8, 2023. All
groundwater monitoring activities were conducted in response to the final project evaluation requirement
specified in Part VII, Item 5 of the Renewal Issuance of Injection Permit W10400198 from the North
Carolina Department of Environmental Quality (NCDEQ) Division of Water Quality — Aquifer Protection
Section in April 2013.
On June 8, 2023, Arcadis completed a semi-annual groundwater monitoring and sampling event at the
Site. Two (2) groundwater monitoring wells (MW-8R and MW-6) were gauged to determine the depth to
water (DTW). DTW ranged from 11.04 feet below top of casing (btoc) in groundwater monitoring well MW-
6 to 12.80 feet btoc in groundwater monitoring well MW-8R. The historical groundwater flow direction for
the Site is towards the southeast.
On June 8, 2023, groundwater samples were collected from groundwater monitoring wells MW-8R and
MW-6. The maximum concentrations of selected dissolved -phase COCs found during the June 2023
sampling events are summarized in the table below:
Maximum Groundwater Concentrations (June 8, 2023)
Chemical of
Monitoring Well
Concentration
North Carolina
Concern
ID
(mg/L)
Groundwater
(COC)
Quality (2L)
Standards
Sulfate
MW-8R
573
250
Note: Concentration in Bold exceeds the applicable North Carolina GCL Standard
mg/L: milligrams per liter
Dissolved phase sulfate concentrations remained stable compared to historical groundwater analytical
data. Dissolved phase sulfate was detected above the applicable North Carolina Groundwater Quality (2L)
Standard at the groundwater monitoring well MW-8R only.
Arcadis recommends discontinuing the semi-annual sampling of groundwater monitoring well MW-6 as the
dissolved phases COCs have not been detected at concentrations exceeding the applicable 2L Standards.
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program at the
Site to document the natural attenuation of sulfate. The next semi-annual groundwater monitoring and
sampling event is scheduled for November 2023. Groundwater monitoring wells MW-8R will be gauged to
evaluate the potentiometric surface at the Site. Pending approval of the above requested modification to
the groundwater sampling program, Arcadis will sample groundwater monitoring well MW-8R for analysis
of sulfate by Standard Method 9056A. A Semi -Annual Groundwater Monitoring Report documenting the
proposed activities for 2023 will be submitted to the NCDEQ for review and approval within 45-days of
receipt of the laboratory analytical report.
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1 st Semi -Annual Monitoring Report — 2023
1.0 SITE HISTORY AND CHARACTERIZATION
Former BP Facility #24163 is located at 381 Knollwood Street, Winston-Salem, Forsyth County, North
Carolina (the Site). The Site is currently owned by Thruway Shopping Center, LLC. and serves as a
parking lot adjacent to surrounding retail stores. The site property is approximately 0.5 acres, covered by
asphalt and concrete, and was formerly developed as a retail fueling station which housed gasoline,
diesel, waste oil, and kerosene Underground Storage Tanks (USTs). A site location map is presented as
Figure 1 and a site map is shown as Figure 2.
The North Carolina Department of Environmental Quality (NCDEQ) issued groundwater incident number
6400 due to a subsurface release of gasoline that occurred on or before September 14, 1983 from a
ruptured product line associated with the UST system. The quantity of the release remains unknown.
One (1) 10,000-gallon steel gasoline UST, three (3) 6,000-gallon steel gasoline USTs, and one (1)
10,000-gallon steel diesel UST were removed from the site in 1990. Three (3) 10,000-gallon gasoline
USTs, one (1) 10,000-gallon diesel UST, and one (1) 550-gallon waste oil UST were subsequently
installed at the site and the site was purchased by M. M. Fowler, Inc. in January 1994 and continued
operation until 2004. The remaining five USTs were removed before 2005 and the site was razed.
Site geology and hydrogeology include surficial deposits immediately underlying the site are described
generally as sandy silts that grade upward to clayey silts and silty clays. Bedrock beneath the site is
mapped as a strongly foliated biotite gneiss and schist. The maximum depth of investigation at the site
has been approximately 55 feet below ground surface (bgs); bedrock has not been encountered during
site investigation work. Historically, the range for shallow groundwater beneath the site is approximately
11 to 14 feet bgs, and groundwater flow direction is toward the southeast with an apparent horizontal
gradient of approximately 0.012 feet per foot (ft/ft). The calculated groundwater seepage velocity for
shallow groundwater beneath the site is approximately 2.8 feet per year.
Two activated sodium persulfate injections were performed at the Site on June 4 — 9, 2012 and June 3 —
6, 2013 under Underground Injection Control (UIC) Permit #W10400198 which was issued by the NCDEQ
Division of Water Quality on August 9, 2011. Approximately 11,237-gallons of sodium persulfate and
6,826-gallons of sodium persulfate were injected at the Site on June 4 — 9, 2012 and June 3 — 6, 2013,
respectively.
The NCDEQ Risk Classification for this site was reduced to "Low" on January 23, 2015 after issuing a
request for Notice of Residual Petroleum (NORP). The NORP was recorded with the Forsyth County
Register of Deeds on March 18, 2015 and imposed the following perpetual restriction on the Site
property:
• Groundwater: Groundwater from the site is prohibited from use as a water supply. Water supply
wells of any kind shall not be installed or operated on the site.
No Further Action (NFA) status was granted for the subject incident number by the NCDEQ on April 28,
2015.
In accordance with UIC Permit #WI0400198, dissolved -phase concentrations of sulfate are being
monitored on a semi-annual basis at the Site. Closure of UIC Permit #W10400198 will be requested once
arcadis.com 5

1 st Semi -Annual Monitoring Report — 2023
dissolved -phase sulfate concentrations are no longer detected above the North Carolina Groundwater
Quality (2L) Standards.
2.0 GRUUNOWATER MONITORING
2.1 Groundwater Gauging
On June 8, 2023, Arcadis G&M of North Carolina, Inc. (Arcadis) personnel gauged groundwater
monitoring wells MW-8R and MW-6. Gauging was conducted with a water interface probe (IP)
prior to purging and sampling to determine DTB and DTW. The IP and attached tape, marked in
0.01-foot increments, were properly decontaminated before each use with Alconox soap and
rinsed with distilled water. The DTW was measured from the marked survey point on the top of
well casing (TOC). All measurements were recorded to the nearest 0.01-foot increment.
The DTW ranged from 11.04 btoc in groundwater monitoring well MW-6 to 12.80 feet btoc in
groundwater monitoring well MW-8R.
Groundwater monitoring well construction details are included in Table 1. Current groundwater
elevations are summarized in Table 2. Historical groundwater gauging data is provided in
Appendix A. A potentiometric surface map depicting historical groundwater flow direction is
provided as Figure 3.
2.2 Groundwater Sampling
On June 8, 2023, groundwater monitoring wells MW-8R and MW-6 were purged of stagnant
water to prepare for groundwater sampling. Prior to purging, the amount of water to be removed
was calculated using the following formula:
3.1415 x rz x (TD-DTW) x 7.481 = gallons of water (1 well volume)
Where: r = radius of well (in feet)
TD = total depth of well (in feet)
DTW = depth to water (in feet)
In order to ensure that the water in the wells after purging is representative of the water in the
aquifer, a minimum of three well volumes were removed.
Groundwater samples obtained from the groundwater monitoring well were collected from
disposable polyethylene bailers using new nylon rope. Groundwater samples were placed in
laboratory -supplied containers and shipped on wet ice to TestAmerica Inc. in Pensacola, Florida,
for analysis of Sulfate (SO4) by Standard Method 9056A. Groundwater samples submitted for
sulfate analysis were collected in 250-milliliter plastic bottles.
The laboratory analytical report and chain -of -custody record for June 8, 2023, groundwater
sampling event is included as Appendix B.
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1 st Semi -Annual Monitoring Report — 2023
2.3 Groundwater Analytical Results
Groundwater analytical data from the June 8, 2023, groundwater sampling event indicated the
following:
• Dissolved -phase concentrations of sulfate were detected in concentrations exceeding the
applicable North Carolina 2L Standard of 250 milligrams per liter (mg/L) in groundwater
monitoring well MW-8R (573 mg/Q.
Current groundwater analytical results are presented in Table 3. Historical groundwater analytical
data can be found in Appendix C. A dissolved phase concentration map is presented as Figure
4. A sulfate iso-concentration map depicting the dissolved -phase extent of sulfate exceeding the
applicable 2L groundwater quality standard is presented in Figure 5.
3.0 SITE REMEDIATION
" I Remediation Activities to Date
Summarized in the table below is a chronology of remediation activities performed at the site to
date:
Date
Activity
September 14, 1983
Subsurface release of gasoline from a ruptured product line
associated with the UST system
December 1990
UST systems associated with release removed; 500 tons of
contaminated soil removed during UST closure
1992
Vacuum Extraction System Installed
1992 - 1994
Vacuum Extraction System Operation
1994 - 2011
Monitoring of site
June 4 — 9, 2012
Activated Sodium Persulfate (ASP) injection event.
Approximately 11,237-gallons of sodium persulfate injected.
June 3 — 6, 2013
ASP injection event. Approximately 6,826-gallons of sodium
persulfate injected.
2013 - Present
Monitored Natural Attenuation
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1 st Semi -Annual Monitoring Report — 2023
4.0 CONCLUSIONS & RFrOMMFNnATION;
Dissolved -phase sulfate was detected above the applicable 2L groundwater quality standard for
sulfate of 250 mg/L in only groundwater monitoring well MW-8R on June 8, 2023.
Arcadis recommends discontinuing the semi-annual sampling of groundwater monitoring well
MW-6 as the dissolved phases COCs have not been detected at concentrations exceeding the
applicable 2L Standards.
Arcadis recommends continuing the semi-annual groundwater monitoring and sampling program
at the Site to document the natural attenuation of sulfate. The next semi-annual groundwater
monitoring and sampling event is scheduled for November 2023. Groundwater monitoring wells
MW-8R will be gauged to evaluate the potentiometric surface at the Site. Pending approval of the
above requested modification to the groundwater sampling program, Arcadis will sample
groundwater monitoring well MW-8R for analysis of sulfate by Standard Method 9056A. A Semi -
Annual Groundwater Monitoring Report documenting the proposed activities for 2023 will be
submitted to the NCDEQ for review and approval within 45-days of receipt of the laboratory
analytical report.
arcadis.com 8

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Table 2
Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
POAICADIS
MW-8R 6/8/2023 NS ND 12.80 0.00 NM
MW-6 6/8/2023 98.68 ND 11.04 0.00 87.64
Notes:
1. Measured in feet relative to site datum
2. Corr. GW Elev. _ (ref. point elevation) - (depth to groundwater) + (LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
LNAPL = Light non -aqueous phase liquid
ND = Not Detected
NM = Not Measured
NS = Not Surveyed
TOC = Top of casing
btoc = below top of casing
Page 1 of 1

Table 3
Summary of Groundwater Analytical Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, NC
Date Sampled
Units
Sulfate
AARCADIS
6/8/2023
6/8/2023
mg/L
mg/L
573
26.3
Notes:
mg/L - milligrams per liter
BOLD text indicates exceendance of NC groundwater
standard 2L for sulfate (250 mg/L).
Page 1 of 1

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Historical Groundwater Elevation Data

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
4I F CADI
06/24/93
ND
13.89
0.00
85.14
08/23/94
ND
14.36
0.00
84.67
03/21/95
ND
13.58
0.00
85.45
08/05/96
ND
13.54
0.00
85.49
11/17/98
ND
14.09
0.00
84.94
06/19/01
ND
14.11
0.00
84.92
09/12/01
ND
14.41
0.00
84.62
12/27/01
ND
14.51
0.00
84.52
03/05/02
ND
14.29
0.00
84.74
05/13/03
12/09/03
ND
ND
14.35
13.63
0.00
0.00
84.68
85.40
03/23/06
ND
13.64
0.00
85.39
05/08/07
ND
13.40
0.00
85.63
05/14/08
ND
13.42
0.00
85.61
05/28/09
ND
13.31
0.00
85.72
05/27/10
ND
13.07
0.00
85.96
10/31/11
ND
13.87
0.00
85.16
MW 3
99.03
05/22/12
ND
13.55
0.00
85.48
06/14/12
ND
13.53
0.00
85.50
07/09/12
ND
13.98
0.00
85.05
08/14/12
ND
14.24
0.00
84.79
09/19/12
ND
14.08
0.00
84.95
12/05/12
ND
14.42
0.00
84.61
02/26/13
ND
13.55
0.00
85.48
05/31/13
ND
13.58
0.00
85.45
08/28/13
ND
13.57
0.00
85.46
11/07/13
ND
14.30
0.00
84.73
02/27/14
ND
13.28
0.00
85.75
06/02/14
ND
13.34
0.00
85.69
10/16/14
ND
14.18
0.00
84.85
04/23/15
ND
13.54
0.00
85.49
04/28/16
ND
13.51
0.00
85.52
09/19/16
ND
13.92
0.00
85.11
03/03/17
06/24/93
ND
ND
NM
13.51
0.00
0.00
NM_
85.88
08/23/94
ND
13.82
0.00
85.57
03/21/95
ND
13.71
0.00
85.68
08/05/96
ND
13.54
0.00
85.85
11/17/98
ND
14.08
0.00
85.31
06/19/01
NM
NM
NM
NM
09/12/01
ND
14.46
0.00
84.93
MW-5
12/27/01 99.39
14.51
15.07
0.56
84.73
03/O5/02
14.45
14.88
0.43
84.82
05/12/03
NM
NM
NM
NM
12/09/03
13.18
13.60
0.42
86.10
03/23/06
ND
13.67
0.00
85.72
05/08/07
ND
13.45
0.00
85.94
05/14/08
ND
13.51
0.00
85.88
05/28/09
ND
13.39
0.00
86.00
Page 1 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
4I F CADI
05/27/10
ND
13.70
0.00
NM
10/31/11
ND
13.97
0.00
NM
05/22/12
ND
13.66
0.00
NM
06/14/12
ND
13.73
0.00
NM
07/09/12
ND
14.18
0.00
NM
08/14/12
ND
14.45
0.00
NM
09/19/12
ND
14.35
0.00
NM
12/05/12
ND
14.68
0.00
NM
02/26/13
ND
13.89
0.00
NM
05/31/13
ND
13.77
0.00
NM
08/28/13
ND
13.83
0.00
NM
MW-5R
11/07/13 NS
ND
14.53
0.00
NM
02/27/14
ND
13.39
0.00
NM
06/02/14
ND
13.47
0.00
NM
10/16/14
ND
14.32
0.00
NM
04/23/15
ND
13.69
0.00
NM
10/13/15
ND
14.19
0.00
NM
04/28/16
ND
13.61
0.00
NM
09/19/16
ND
13.99
0.00
NM
03/03/17
ND
14.01
0.00
NM
09/20/17
ND
13.67
1.00
NM
03/01/18
ND
13.62
0.00
NM
08/20/18
ND
13.61
0.00
NM
06/24/93
ND
12.31
0.00
86.37
08/23/94
ND
12.61
0.00
86.07
03/21/95
ND
13.15
0.00
85.53
08/05/96
ND
12.39
0.00
86.29
11/17/98
ND
13.16
0.00
85.52
06/19/01
NM
NM
NM
NM
09/12/01
ND
13.51
0.00
85.17
12/27/01
ND
13.61
0.00
85.07
03/05/02
ND
11.02
0.00
87.66
05/12/03
ND
11.10
0.00
87.58
12/09/03
ND
13.49
0.00
85.19
03/23/06
ND
11.79
0.00
86.89
MW-6
05/08/07 98.68
ND
12.50
0.00
86.18
05/14/08
ND
12.16
0.00
86.52
05/28/09
ND
10.64
0.00
88.04
05/27/10
ND
11.84
0.00
86.84
10/31/11
ND
12.95
0.00
85.73
06/02/14
ND
12.38
0.00
86.30
03/25/20
ND
11.50
0.00
87.18
09/01/20
ND
11.80
0.00
86.88
04/02/21
ND
9.55
0.00
89.13
11/16/21
ND
12.44
0.00
86.24
04/06/22
ND
11.65
0.00
87.03
12/30/22
ND
12.30
0.00
86.38
06/08/23
ND
11.04
0.00
87.64
06/24/93
ND
NM
0.00
NM
08/23/94
ND
NM
0.00
NM
03/21/95
ND
14.75
0.00
84.51
08/05/96
ND
14.13
0.00
85.13
11/17/98
ND
14.09
0.00
85.17
06/19/01
ND
18.07
0.00
81.19
09/12/01
ND
16.60
0.00
82.66
12/27/01
ND
14.61
0.00
84.65
03/05/02
ND
14.96
0.00
84.30
MW-6i
05/12/03 99.26
ND
15.17
0.00
84.09
12/09/03
ND
13.55
0.00
85.71
03/23/06
ND
13.55
0.00
85.71
05/08/07
ND
12.93
0.00
86.33
05/14/08
ND
13.22
0.00
86.04
05/28/09
ND
13.39
0.00
85.87
05/27/10
ND
13.23
0.00
86.03
10/31/11
ND
13.90
0.00
85.36
06/02/14
ND
13.35
0.00
85.91
04/28/16
ND
13.55
1 0.00
85.71
Page 2 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
4I F CADI
08/23/94
ND
12.14
0.00
85.70
03/21/95
08/05/96
ND
ND
1202.
11.99
0.00
0.00
85.82
85.85
* 11/17/98
ND
12.53
0.00
85.31
* 06/19/01
NM
NM
NM
NM
* 09/12/01
ND
12.67
0.00
85.17
12/27/01
14.47
15.03
0.56
83.26
MW 8 97.84
* 03/05/02
12.42
12.60
0.18
85.38
05/12/03
NM
NM
NM
NM
12/09/03
13.32
13.56
0.24
84.47
03/23/06
ND
12.15
0.00
85.69
05/08/07
ND
11.90
0.00
85.94
05/14/08
ND
11.95
0.00
85.89
05/28/09
ND
11.70
0.00
86.14
05/27/10
ND
12.97
0.00
NM
10/31/11
ND
13.34
0.00
NM
05/22/12
ND
13.69
0.00
NM
06/14/12
ND
14.94
0.00
NM
07/09/12
ND
14.08
0.00
NM
08/14/12
ND
14.29
0.00
NM
09/19/12
ND
14.08
0.00
NM
12/05/12
ND
14.53
0.00
NM
02/26/13
ND
13.80
0.00
NM
05/31/13
ND
13.61
0.00
NM
08/28/13
ND
13.74
0.00
NM
11/07/13
ND
14.42
0.00
NM
02/27/14
ND
13.33
0.00
NM
06/02/14
ND
13.34
0.00
NM
10/16/14
ND
14.18
0.00
NM
04/23/15
ND
13.57
0.00
NM
MW-8R NS
10/13/15
ND
14.08
0.00
NM
04/28/16
ND
13.53
0.00
NM
09/19/16
ND
13.91
0.00
NM
03/03/17
ND
13.92
0.00
NM
09/20/17
ND
13.61
0.00
NM
03/01/18
ND
13.63
0.00
NM
08/20/18
ND
13.52
0.00
NM
03/15/19
ND
13.35
0.00
NM
10/08/19
ND
13.54
0.00
NM
03/25/20
ND
12.59
0.00
NM
09/01/20
ND
12.72
0.00
NM
04/02/21
ND
12.16
0.00
NM
11/16/21
ND
13.25
0.00
NM
04/06/22
ND
12.87
0.00
NM
12,30/22
ND
13.15
0.00
NM
06/08/23
ND
12.80
0.00
NM
06/24/93
NM
NM
NM
NM
08/23/94
03/21/95
NM
ND
NM
13.55
NM
0.00
NM
86.89
08/O5/96
ND
13.64
0.00
86.80
11/17/98
ND
14.26
0.00
86.18
06/19/01
ND
14.55
0.00
85.89
09/12/01
ND
14.81
0.00
85.63
12/27/01
ND
14.85
0.00
85.59
03/05/02
ND
14.64
0.00
1 85.80
MW-14 05/12/03 100.44
ND
13.41
0.00
87.03
12/09/03
ND
13.51
0.00
86.93
03/23/06
ND
13.82
0.00
86.62
05/08/07
ND
13.54
0.00
86.90
05/14/08
ND
13.64
0.00
86.80
05/28/09
ND
13.47
0.00
86.97
05/27/10
ND
13.00
0.00
87.44
10/13/11
ND
14.14
0.00
86.30
06/02/14
ND
13.42
0.00
87.02
04/28/16
ND
13.65
0.00
86.79
Page 3 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
4I F CADI
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.83
0.00
87.08
08/05/96
ND
12.77
0.00
87.14
11/17/98
ND
13.58
0.00
86.33
06/19/01
ND
13.80
0.00
86.11
09/12/01
ND
14.18
0.00
85.73
12/27/01
ND
14.29
0.00
85.62
03/05/02
ND
13.98
0.00
85.93
05/12/03
NM
12.75
NM
87.16
MW-15
99.91
12/09/03
ND
12.89
0.00
87.02
03/23/06
ND
13.14
0.00
86.77
05/08/07
ND
12.90
0.00
87.01
05/14/08
ND
13.12
0.00
86.79
05/28/09
ND
12.90
0.00
87.01
05/27/10
ND
12.25
0.00
87.66
10/31/11
ND
13.61
0.00
86.30
06/02/14
ND
12.82
0.00
87.09
10/16/14
ND
13.91
0.00
86.00
04/28/16
ND
13.15
0.00
86.76
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM
03/21/95
ND
12.06
0.00
85.36
08/05/96
ND
12.09
0.00
85.33
11/17/98
ND
12.60
0.00
84.82
06/19/01
ND
12.74
0.00
84.68
09/12/01
ND
12.98
0.00
84.44
12/27/01
NM
NM
NM
NM
03/05/02
ND
12.83
0.00
84.59
MW-16
05/12/03 97.42
NM
NM
NM
NM
12/09/03
ND
12.13
0.00
85.29
03/23/06
ND
12.18
0.00
85.24
05/08/07
NM
NM
NM
NM
05/14/08
ND
12.03
0.00
85.39
05/28/09
ND
11.96
0.00
85.46
05/27/10
ND
11.69
0.00
85.73
10/31/11
ND
12.45
0.00
84.97
11/07/13
ND
12.88
0.00
84.54
06/02/14
ND
11.97
0.00
85.45
06/24/93
NM
NM
NM
NM
08/23/94
NM
NM
NM
NM_
03/21/95
ND
14.42
0.00
85.58
08/05/96
ND
14.46
0.00
1 85.54
11/17/98
ND
14.91
0.00
85.09
06/19/01
ND
15.03
0.00
84.97
09/12/01
ND
15.28
0.00
84.72
12/27/01
ND
15.37
0.00
84.63
03/05/02
ND
15.15
0.00
84.85
05/12/03
NM
14.15
NM
85.85
MW-17
100.00
12/09/03
ND
14.50
0.00
85.50
03/23/06
ND
14.45
0.00
85.55
05/08/07
ND
14.22
0.00
85.78
05/14/08
ND
14.22
0.00
85.78
05/28/09
ND
14.12
0.00
85.88
05/27/10
ND
13.90
0.00
86.10
10/31/11
ND
14.72
0.00
85.28
06/02/14
ND
14.14
0.00
85.86
04/28/16
ND
14.36
0.00
85.64
Page 4 of 5

Appendix A
Historical Groundwater Elevation Data
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
4I F CADI
10/31/11 ND 13.95 0.00 NM
O5/22/12 ND 14.10 0.00 NM
06/14/12 ND 13.61 0.00 NM
07/09/12 ND 14.05 0.00 NM
08/14/12 ND 14.43 0.00 NM
09/19/12 ND 14.34 0.00 NM
12/05/12 ND 14.62 0.00 NM
02/26/13 ND 14.67 0.00 NM
O5/31/13 ND 14.57 0.00 NM
08/28/13 ND 14.33 0.00 NM
11/07/13 ND 14.51 0.00 NM
MW-18
NS
02/27/14 ND 13.76 0.00 NM
06/02/14 ND 13.55 0.00 NM
10/16/14 ND 14.37 0.00 NM
04/23/15 ND 13.84 0.00 NM
10/13/15 ND 14.81 0.00 NM
04/28/16 ND 13.62 0.00 NM
09/19/16 ND 14.04 0.00 NM
03/03/17 ND 14.08 0.00 NM
09/20/17 ND 13.21 0.00 NM
03/01/18 ND 13.60 0.00 NM
08/20/18 ND 13.42 0.00 NM
10/31/11 ND 13.75 0.00 NM
O5/22/12 ND 13.37 0.00 NM
06/14/12 ND 13.39 0.00 NM
07/09/12 ND 13.89 0.00 NM
08/14/12 ND 14.13 0.00 NM
09/19/12 ND 14.02 0.00 NM
12/05/12 ND 14.39 0.00 NM
02/26/13 ND 13.62 0.00 NM
O5/31/13 ND 13.47 0.00 NM
08/28/13 ND 13.56 0.00 NM
11/07/13 ND 14.25 0.00 NM
02/27/14 ND 13.17 0.00 NM
MW-19
06/02/14 NS ND 13.14 0.00 NM
10/16/14 ND 14.03 0.00 NM
04/23/15 ND 13.46 0.00 NM
10/13/15 ND 14.01 0.00 NM
04/28/16 ND 13.38 0.00 NM
09/19/16 ND 13.75 0.00 NM
03/03/17 ND 13.79 0.00 NM
09/20/17 ND 13.48 0.00 NM
03/01/18 ND 13.42 0.00 NM
08/20/18 ND 13.38 0.00 NM
03/15/19 ND 12.22 0.00 NM
10/08/19 ND 1 13.27 1 0.00 1 NM
03/25/20 Paved Over - Destroyed (4)
Notes:
1. Measured in feet relative to site datum
2. Corr. GW Elev. _ (ref. point elevation) - (depth to groundwater) + (LNAPL thickness)(LNAPL specific gravity)
3. LNAPL specific gravity assumed to be 0.73
4. MW-19 was paved over and presumed destroyed on 3/25/2020.
* - Prior to URS' work at this Site, monitoring well MW-3 has previously been reported as MW-2, monitoring well MW-6 has previously been reported
as MW-8, and monitoring well MW-8 has previously been reported as MW-6.
LNAPL = Light non -aqueous phase liquid
ND = Not detected
NM = Not measured
NS = Not Surveyed
TOC = Top of casing
btoc = below top of casing
During the May 2003 sampling event LNAPL was observed in MW-5. Depth to groundwater and thickness of LNAPL were not measured
Page 5 of 5

/_1:2 :2 =1L,II]PA:1
Laboratory Analytical Report and Chain -of -Custody Record — June 13,
2023

tiff eurofins
Environment Testing
ANALYTICAL REPORT
PREPARED FOR
Attn: Hardik Patel
ARCADIS US Inc ■r�
5420 Wade Park Boulevard
Suite 350
Raleigh, North Carolina 27607
Generated 6/13/2023 11:25:56 AM
JOB DESCRIPTION
BP 24163 Winston Salem NC
JOB NUMBER
400-238950-1

This report may not be reproduced except in full, and with written approval from the laboratory. The results relate only to the
samples tested. For questions please contact the Project Manager at the e-mail address or telephone number listed on this
page.
The test results in this report relate only to the samples as received by the laboratory and will meet all requirements of the
methodology, with any exceptions noted. This report shall not be reproduced except in full, without the express written
approval of the laboratory. All questions should be directed to the Eurofins Environment Testing Southeast, LLC Project
Manager.
Generated
6/13/2023 11:25:56 AM
Authorized for release by
Leah Klingensmith, Senior Project Manager Is
Leah. Klingensmith(cDet.euroflnsus.com
[phone]
Eurofins Pensacola is a laboratory within Eurofins Environment Testing Southeast, LLC, a company within Eurofins Environment Testing Group of Companies
Page 2 of 17 6/13/2023

Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Laboratory Job ID: 400-238950-1
Table of Contents
Cover Page ..............................................
1
Table of Contents .........................................
3
Sample Summary .........................................
4
Case Narrative ...........................................
5
Definitions ...............................................
6
Client Sample Results ......................................
7
QC Sample Results ........................................
9
QC Association ...........................................
10
Chronicle................................................
11
Method Summary .........................................
12
Certification Summary ......................................
13
Chain of Custody ..........................................
14
Receipt Checklists .........................................
16
Eurofins Pensacola
Page 3 of 17 6/13/2023

Sample Summary
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Lab Sample ID Client Sample ID
400-238950-1 MW-8R
400-238950-2 MW-6
Matrix Collected Received
Water 06/08/2314:40 06/09/2310:09
Water 06/08/2314:55 06/09/2310:09
Job ID: 400-238950-1
Page 4 of 17
Eurofins Pensacola
6/13/2023

Case Narrative
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Job ID: 400-238950-1
Laboratory: Eurofins Pensacola
Narrative
Job ID: 400-238950-1
F47
Job Narrative
400-238950-1
Receipt
The samples were received on 6/9/2023 10:09 AM. Unless otherwise noted below, the samples arrived in good condition, and, where
required, properly preserved and on ice. The temperature of the cooler at receipt time was 1.8°C
HPLC/IC
No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.
Eurofins Pensacola
Page 5 of 17 6/13/2023

Definitions/Glossary
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Glossary
Abbreviation These commonly used abbreviations may or may not be present in this report.
0 Listed under the "D" column to designate that the result is reported on a dry weight basis
%R Percent Recovery
CFL Contains Free Liquid
CFU Colony Forming Unit
CNF Contains No Free Liquid
DER Duplicate Error Ratio (normalized absolute difference)
Dil Fac Dilution Factor
DL Detection Limit (DoD/DOE)
DL, RA, RE, IN Indicates a Dilution, Re -analysis, Re -extraction, or additional Initial metals/anion analysis of the sample
DLC Decision Level Concentration (Radiochemistry)
EDL Estimated Detection Limit (Dioxin)
LOD Limit of Detection (DoD/DOE)
LOQ Limit of Quantitation (DoD/DOE)
MCL EPA recommended "Maximum Contaminant Level'
MDA Minimum Detectable Activity (Radiochemistry)
MDC Minimum Detectable Concentration (Radiochemistry)
MDL Method Detection Limit
ML Minimum Level (Dioxin)
MPN Most Probable Number
MQL Method Quantitation Limit
NC Not Calculated
ND Not Detected at the reporting limit (or MDL or EDL if shown)
NEG Negative / Absent
POS Positive / Present
PQL Practical Quantitation Limit
PRIES Presumptive
QC Quality Control
RER Relative Error Ratio (Radiochemistry)
RL Reporting Limit or Requested Limit (Radiochemistry)
RPD Relative Percent Difference, a measure of the relative difference between two points
TEF Toxicity Equivalent Factor (Dioxin)
TEQ Toxicity Equivalent Quotient (Dioxin)
TNTC Too Numerous To Count
Job ID: 400-238950-1
Eurofins Pensacola
Page 6 of 17 6/13/2023

Client Sample Results
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Job ID: 400-238950-1
Client Sample ID: MW-8R Lab Sample ID: 400-238950-1
Date Collected: 06/08/23 14:40 Matrix: Water
Date Received: 06/09/23 10:09
Method: SW846 9056A -Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 573 10.0
MDL Unit D Prepared Analyzed Dil Fac
mg/L 06/12/2311:39 10
Eurofins Pensacola
Page 7 of 17 6/13/2023

Client Sample Results
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Job ID: 400-238950-1
Client Sample ID: MW-6 Lab Sample ID: 400-238950-2
Date Collected: 06/08/23 14:55 Matrix: Water
Date Received: 06/09/23 10:09
Method: SW846 9056A -Anions, Ion Chromatography
Analyte Result Qualifier RL
Sulfate 26.3 1.00
MDL Unit D Prepared Analyzed Dil Fac
mg/L 06/12/2312:11 1
Eurofins Pensacola
Page 8 of 17 6/13/2023

QC Sample Results
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Method: 9056A - Anions, Ion Chromatography
Lab Sample ID: MB 680-783087/2
Matrix: Water
Analysis Batch: 783087
MB MB
Analyte Result Qualifier
Sulfate
ND
Lab Sample ID: LCS 680-783087/4
Matrix: Water
Analysis Batch: 783087
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: LCSD 680-783087/5
Matrix: Water
Analysis Batch: 783087
Spike
Analyte
Added
Sulfate
10.0
Lab Sample ID: 400-238950-2 MS
Matrix: Water
Analysis Batch: 783087
Sample
Sample
Spike
Analyte Result
Qualifier
Added
Sulfate 26.3
10.0
Lab Sample ID: 400-238950-2 MSD
Matrix: Water
Analysis Batch: 783087
Sample
Sample
Spike
Analyte Result
Qualifier
Added
Sulfate 26.3
10.0
Job ID: 400-238950-1
Client Sample ID: Method Blank
Prep Type: Total/NA
RL
MDL Unit
D Prepared Analyzed Dil Fac
1.00
mg/L
06/12/2310:41 1
Client Sample ID: Lab Control Sample
Prep Type: Total/NA
LCS
LCS
%Rec
Result
Qualifier
Unit
D %Rec Limits
10.10
mg/L
101 90 -110
Client Sample ID: Lab Control Sample Dup
Prep Type: Total/NA
LCSD
LCSD
%Rec RPD
Result
Qualifier
Unit
D %Rec Limits RPD Limit
10.26
mg/L
103 90 -110 2 15
Client Sample ID: MW-6
Prep Type: Total/NA
MS
MS
%Rec
Result
Qualifier
Unit
D %Rec Limits
35.82
mg/L
95 80 -120
Client Sample ID: MW-6
Prep Type: Total/NA
MSD
MSD
%Rec RPD
Result
Qualifier
Unit
D %Rec Limits RPD Limit
36.03
mg/L
97 80 -120 1 15
Eurofins Pensacola
Page 9 of 17 6/13/2023

QC Association Summary
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
H P LC/I C
Analysis Batch: 783087
Lab Sample ID
Client Sample ID
400-238950-1
MW-8R
400-238950-2
MW-6
MB 680-783087/2
Method Blank
LCS 680-783087/4
Lab Control Sample
LCSD 680-783087/5
Lab Control Sample Dup
400-238950-2 MS
MW-6
400-238950-2 MSD
MW-6
Job ID: 400-238950-1
Prep Type
Matrix
Method Prep Batch
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Total/NA
Water
9056A
Eurofins Pensacola
Page 10 of 17 6/13/2023

Lab Chronicle
Client: ARCADIS US Inc
Job ID: 400-238950-1
Project/Site: BP 24163 Winston Salem NC
Client Sample ID: MW-8R
Lab Sample ID: 400-238950-1
Date Collected: 06/08/23 14:40
Matrix: Water
Date Received: 06/09/23 10:09
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
10
5 mL
5 mL
783087 06/12/23 11:39 UI EET SAV
Client Sample ID: MW-6
Lab Sample ID: 400-238950-2
Date Collected: 06/08/23 14:55
Matrix: Water
Date Received: 06/09/23 10:09
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 12:11 UI EET SAV
Client Sample ID: Method Blank
Lab Sample ID: MB 680-783087/2
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 10:41 UI EET SAV
Client Sample ID: Lab Control Sample
Lab Sample ID: LCS 680-783087/4
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 11:06 UI EET SAV
Client Sample ID: Lab Control Sample Dup
Lab Sample ID: LCSD 680-783087/5
Date Collected: N/A
Matrix: Water
Date Received: N/A
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 11:19 UI EET SAV
Client Sample ID: MW-6
Lab Sample ID: 400-238950-2 MS
Date Collected: 06/08/23 14:55
Matrix: Water
Date Received: 06/09/23 10:09
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 12:24 UI EET SAV
Client Sample ID: MW-6
Lab Sample ID: 400-238950-2 MSD
Date Collected: 06/08/23 14:55
Matrix: Water
Date Received: 06/09/23 10:09
Batch Batch
Dil
Initial
Final
Batch Prepared
Prep Type Type Method Run
Factor
Amount
Amount
Number or Analyzed Analyst Lab
Total/NA Analysis 9056A
1
5 mL
5 mL
783087 06/12/23 12:36 UI EET SAV
Laboratory References:
EET SAV = Eurofins Savannah, 5102 LaRoche Avenue, Savannah, GA 31404, TEL [phone]
Eurofins Pensacola
Page 11 of 17 6/13/2023

Method Summary
Client: ARCADIS US Inc
Project/Site: BP 24163 Winston Salem NC
Job ID: 400-238950-1
Method Method Description Protocol Laboratory
9056A Anions, Ion Chromatography SW846 EET SAV
Protocol References:
SW846 = "Test Methods For Evaluating Solid Waste, Physical/Chemical Methods", Third Edition, November 1986 And Its Updates.
Laboratory References:
EET SAV = Eurofins Savannah, 5102 LaRoche Avenue, Savannah, GA 31404, TEL [phone]
[a
Eurofins Pensacola
Page 12 of 17 6/13/2023

Accreditation/Certification Summary
Client: ARCADIS US Inc Job ID: 400-238950-1
Project/Site: BP 24163 Winston Salem NC
Laboratory: Eurofins Savannah
All accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report.
Authority
Program
Identification Number
Expiration Date
AFCEE
SAVLAB
Alabama
State
41450
06-30-23
ANAB
Dept. of Defense ELAP
L2463
09-22-24
Arkansas DEQ
State
19-015-0
02-01-24
California
State
2939
06-30-23
Florida
NELAP
E87052
06-30-23
Georgia
State
E87052
06-30-23
Georgia (DR
State
803
06-30-23
Guam
State
19-007R
04-17-24
Hawaii
State
<cert No.>
06-30-23
Illinois
NELAP
200022
11-30-23
Indiana
State
C-GA-02
06-30-23
Iowa
State
353
06-30-23
Kentucky (UST)
State
NA
06-30-23
Louisiana
NELAP
30690
06-30-23
Louisiana (All)
NELAP
30690
06-30-23
Louisiana (DR
State
LA009
12-31-23
Maine
State
GA00006
09-25-24
Maryland
State
250
12-31-23
Massachusetts
State
M-GA006
06-30-23
Michigan
State
9925
06-30-23
Mississippi
State
<cert No.>
06-30-23
Nebraska
State
NE-OS-7-04
06-30-23
New Jersey
NELAP
GA769
06-30-23
New Mexico
State
GA00006
06-30-23
North Carolina (DR
State
13701
07-31-23
North Carolina (WW/S"
State
269
12-31-23
Pennsylvania
NELAP
68-00474
06-30-23
Puerto Rico
State
GA00006
01-01-24
South Carolina
State
98001
06-30-23
Tennessee
State
TN02961
06-30-23
Texas
NELAP
T1047004185-19-14
11-30-23
Texas
TCEQ Water Supply
T104704185
06-30-23
USDA
US Federal Programs
P330-18-00313
09-03-24
Virginia
NELAP
460161
06-14-23
Wyoming
State
8TMS-L
06-30-23
Eurofins Pensacola
Page 13 of 17 6/13/2023

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Client: ARCADIS US Inc
Login Number: 238950
List Number: 1
Creator: Roberts, Alexis J
Question
Login Sample Receipt Checklist
Answer Comment
Radioactivity wasn't checked or is </= background as measured by a survey
N/A
meter.
The cooler's custody seal, if present, is intact.
N/A
Sample custody seals, if present, are intact.
N/A
The cooler or samples do not appear to have been compromised or
True
tampered with.
Samples were received on ice.
True
Cooler Temperature is acceptable.
True
Cooler Temperature is recorded.
True
COC is present.
True
COC is filled out in ink and legible.
True
COC is filled out with all pertinent information.
True
Is the Field Sampler's name present on COC?
True
There are no discrepancies between the containers received and the COC.
True
Samples are received within Holding Time (excluding tests with immediate
True
HTs)
Sample containers have legible labels.
True
Containers are not broken or leaking.
True
Sample collection date/times are provided.
True
Appropriate sample containers are used.
True
Sample bottles are completely filled.
True
Sample Preservation Verified.
N/A
There is sufficient vol. for all requested analyses, incl. any requested
True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is
N/A
<6mm (1/4").
Multiphasic samples are not present.
True
Samples do not require splitting or compositing.
True
Residual Chlorine Checked.
N/A
1.8°C IR11
Job Number: 400-238950-1
List Source: Eurofins Pensacola
Eurofins Pensacola
Page 16 of 17 6/13/2023

Login Sample Receipt Checklist
Client: ARCADIS US Inc
Job Number: 400-238950-1
Login Number: 238950
List Number: 2
Creator: Watters, David
Question
List Source: Eurofins Savannah
List Creation: 06/10/23 01:16 PM
Answer Comment
Radioactivity wasn't checked or is </= background as measured by a survey
N/A
meter.
The cooler's custody seal, if present, is intact.
True
Sample custody seals, if present, are intact.
True
The cooler or samples do not appear to have been compromised or
True
tampered with.
Samples were received on ice.
True
Cooler Temperature is acceptable.
True
Cooler Temperature is recorded.
True
COC is present.
True
COC is filled out in ink and legible.
True
COC is filled out with all pertinent information.
True
Is the Field Sampler's name present on COC?
N/A
There are no discrepancies between the containers received and the COC.
True
Samples are received within Holding Time (excluding tests with immediate
True
HTs)
Sample containers have legible labels.
True
Containers are not broken or leaking.
True
Sample collection date/times are provided.
True
Appropriate sample containers are used.
True
Sample bottles are completely filled.
True
Sample Preservation Verified.
N/A
There is sufficient vol. for all requested analyses, incl. any requested
True
MS/MSDs
Containers requiring zero headspace have no headspace or bubble is
N/A
<6mm (1/4").
Multiphasic samples are not present.
True
Samples do not require splitting or compositing.
True
Residual Chlorine Checked.
True
Eurofins Pensacola
Page 17 of 17 6/13/2023

APPENDIX C
Historical Groundwater Analytical Data

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
PARCADIS
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE
NC 2L 1 600 600 500 20 250 NE
Units: Ng/I Ng/I Ng/I Ng/I Ng/I mg/I mg/I
5/13/2003 8.5 0.98 J 0.61 J 1.7 J 8
12/9/2003 47.4 14.3 1.9 8.1 37.3
3/23/2006 4.5 J < 0.5 < 0.5 UJ < 1 UJ 5.5
5/8/2007 40.4 3.7 1.4 2 J 13.1
5/14/2008 4.3 J < 0.8 < 0.7 < 0.8 14
5/28/2009 5.4 0.44 J 0.14 J 0.49 J 5.6
5/27/2010 0.44 J < 0.11 0.3 J < 0.32 4.8
10/31 /2011 5.5 0.76 < 0.17 U 0.38 J 19.1 8.4 405
5/22/2012 < 0.43 U < 0.2 < 0.2 << 0.52 4.6 15.3 378
6/14/2012 12.1 6.7 0.72 4.7 I 15.4 6.6 J 344
7/9/2012 2.2 1.6 2.6 3 14.7 9.9 393
MW-3 8/14/2012 2 2.1 < 0.13 0.4 J 17.9 3.6 303
9/19/2012 2.7 0.66 < 0.13 0.33 J 19.8 2.8 459
12/5/2012 11.3 1.2 0.43 J 1.1 J 19.3 0.78 J 377
2/26/2013 0.23 J < 0.1 < 0.1 < 0.22 5.4 32.6 338
5/31 /2013 0.32 J < 0.1 < 0.1 < 0.22 10.5 17.9 334
8/28/2013 3.6 0.53 0.12 J 0.31 J 10.3 21.9 457
11 /7/2013 4.3 0.27 J 0.13 J < 0.22 10 21.7 536
2/27/2014 < 0.1 < 0.1 < 0.1 < 0.2 1.3 42.2 198
6/3/2014 0.48 J 0.15 J < 0.1 < 0.2 3.1
10/16/2014 18.0 372
4/23/2015 22.8 296
9/19/2016 21.3
3/23/2006 11,700 2,440 32,000 13,500 16,100
3/23/2006 (1) 11,000 2,370 30,700 13,200 15,400
5/8/2007 7,410 1,590 21,100 8,920 8,830
5/8/2007 (1) 7,400 1,680 20,100 9,290 9,360
MW-5 -
5/14/2008 10,000 2,100 29,000 12,000 18,000
5/14/20080: 10,000 2,100 30,000 12,000 18,000
5/28/2009 7,390 9 2,330 25,700 13,400 6,920
5/28/2007 6,510 2,240 22,100 12,900 6,510
5/27/2010 pr 6,610 Q 2,810 24,300 J 15,700 4,330
5/27/2010 (1) 6,090 9 2,380 30,100 J 13,300 4,250
10/31/2011 7,960 _a 2,660 28,000 13,800 3,830 <1 <5
10/31/2011 8,360 2,870 24,600 14,800 4,070
5/22/2012 7,980 3,470 32,200 19,200 3,820 < 5 179
6/15/20127 244 227 1,190 1,120 36.9 6,070 1,820
7/9/2012 336 J 481 J 2,010 J 2,400 J 48.4 J 6,470 2,620
MW-5R 8/14/2012 201 283 1,050 1,300 48.5 14,700 4,190
9/19/2012 158 181 650 883 114 19,000 3,280
12/5/2012 754 505 2,220 2,380 1,160 13,600 1,840
2/26/2013 1,360 878 3,520 3,940 1,660 8,520 1,530
5/31/2013 1,410 1,380 5,930 6,220 1,150J 4,680 1,560
8/28/2013 165 178 489 1,380 417 13,900 1,590
11/7/2013 214 131 331 969 651 14,400 1,570
2/27/2014 142 1 177 328----F 1,060 240 2,990 807
Page 1 of 5

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-5R
MW-6
M W-61
MW-8
NC GCL:
NC 2L
6/2/2014
10/16/2014
4/23/2015
10/13/2015
4/28/2016
9/19/2016
3/3/2017
9/20/2017
3/1/2018
8/20/2018
5/12/2003
12/9/2003
12/9/2003
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
6/2/2014
3/25/2020
9/1/2020
4/2/2021
11/16/2021
4/6/2022
12/30/2022
6/8/2023
5/12/2003
12/9/2003
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5/27/2010
10/31/2011
6/2/2014
3/23/2006
5/8/2007
5/14/2008
5/28/2009
5,000
84,500
260,000
1
600
600
Ng/I
Ng/I
Ng/I
256
I 436
1040
<0.5 0.52J <0.5
2.3 0.64 J 1.1
2.4 0.68 J 1.1
0.76J 0.59J 3.6
< 0.5 < 0.5 < 0.5
< 0.5 < 0.8 < 0.7
<0.06 <0.05 <0.06
<0.11 0.13J 0.38J
8.7J 11.7J 27.5J
17.6J 59.4J 31.6J
< 0.5 < 0.5 < 0.5
< 2.5 < 2.5 < 2.5
49.7 18.9 48.7
<25 <25 <25
5.2J <2 <1.8
2.5 < 0.05 < 0.06
1.6 J < 1.1 < 1.1
0.41 J < 0.36 < 0.32
< 0.1 < 0.1 < 0.1
671 1,340 1730
1,160 799 196
600 1,800 1 700
1,390 2,050 1 357
85,500
20,000
500
20
Ng/I
Ng/I
2520
519 J
<1
3
3.6
17.6
3.8
18
2.8 J
1.1
<1
<0.5
< 0.8
< 0.5
< 0.14
0.17 J
0.46 J
< 0.12
132J
<0.26UJ
99.4 J
783 J
1.1 J
< 0.5
<5
<2.5
443
3,560
< 50
6,910
< 2
3,400
<0.14
1,150
< 3.2
492
< 0.75
122
< 0.2
3.3
8,100
124
2,990
1,440
3,000
190
3,310
1,560
PARCADIS
NE
250
9,950
5,980
5,790
2,980
2,880
3,570
1,060
163
147
131
25.2
38.6
24.0
33.5
31.1
33.8
26.3
NE
NE
Page 2 of 5

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
PARCADIS
NC GCL: 5,000 84,500 260,000 85,500 20,000 NE NE
NC 2L 1 600 600 500 20 250 NE
Units: Ng/I Ng/I Ng/I Ng/I Ng/I mg/I mg/I
5/27/2010 ■ 8,570 2,870 31,700 15,700 6,260
10/31/2011 8,000 3,180 32,100 17,200 3,170 < 1 < 5
5/22/2012 8,270 3,360 36,4001 17,800 3,920 <5 119
6/15/2012 (2) 726 47 J 760 242 J 96.3 J 4,760 22,200
7/9/2012 4,540 J 1,870 J 17,100 J 10,800 J 1,530 J 6,570 4,500
8/14/2012 4,370 1,610 19,300 8,780 2,000 7,010 1,560
9/19/2012 4,780 11800 20,900 f�l
400 2,600 6,700 1,100
12/5/2012 7,760 2,440 31,900 800 4,560 2,410 635
2/26/2013 7,310 2,480 30,500 400 4,530 959 590
5/31/2013 6,540 3,040 30,500 2,500 4,200 439 437
8/28/2013 1,600 628 5,390 3,990 1,380 4,770 703
11/7/2013 11130 329 2,440 1,830 1,770 7,460 766
2/27/2014 1,020 603 3,200 3,430 1,190 7,670 940
6/2/2014 [J3600J 680 J 3,510 J 3,330 J 2,110 J --6/2/2014 (1)556 J 3,650 2,630 J 2,640 J
10/16/2014 0 883 91070 4,990 3,910 3,560 842
MW-8R 4/23/2015 2,050 812
10/13/2015 1,600
4/29/2016 1,640
9/19/2016 1,330
3/3/2017 1,720
9/20/2017 797
3/1/2018 677
8/20/2018 436
3/15/2019 60
10/8/2019 475
3/25/2020 450
9/1/2020 442
4/2/2021 306
11/16/2021 711
4/6/2022 696
12/30/2022 381
6/8/2023 573
5/12/2003 < 0.5 < 0.5 < 0.5 < 1 0.52 J
12/9/2003 < 0.5 < 0.5 < 0.5 < 1 5.9
3/23/2006 < 0.5 < 0.5 < 0.5 < 1 < 0.5
5/8/2007 < 0.5 < 0.5 < 0.5 < 1 < 0.5
MW-14 5/14/2008 < 0.5 < 0.8 < 0.7 < 0.8 < 0.5
5/28/2009 < 0.06 < 0.05 0.077 J < 0.14 < 0.06
5/27/2010 < 0.11 < 0.11 < 0.11 < 0.32 < 0.12
10/31/2011 <0.13 <0.15 <0.42U <0.3 <0.13 43.2 <5
6/3/2014 <0.1 <0.1 <0.1 <0.2 <0.1
3/23/2006 0.63 J 2.1 < 0.5 18.6 1.6
5/8/2007 < 0.5 < 0.5 < 0.5 2.2 J < 0.5
5/14/2008 < 0.5 < 0.8 < 0.7 3.7 J < 0.5
MW-15 5/27/2010 < 0.11 < 0.11 < 0.11 < 0.32 < 0.12
10/31/2011 <0.13 <0.15 <0.13 <0.3 <0.13 <1 <5
6/3/2014 <0.1 <0.1 <0.1 <0.2 <0.1
10/16/2014 <0.1 <0.1 <0.1 <0.2 <0.1
3/23/2006 < 2.5 90.8 15.8 836 2.8 J
5/14/2008 <0.5 160 15 1,600 4.1 J
5/27/2010 3.6 54.7 J 5.1 525 J 1.3
MW-16
10/31/2011 < 0.65 17.2 < 1.4 U 321 < 0.65 194 < 5
11/7/2013 -- 55.4 <5
6/3/2014 < 0.1 25 0.92 417 J < 0.1
Page 3 of 5

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
MW-17
MW-18
NC GCL: 5,000
NC 2L 1
Units: Ng/I
5/13/2003
57.7
5/13/2003
40.8
12/9/2003
6.6
3/23/2006
1
5/8/2007
< 0.5
5/14/2008
3.7 J
5/28/2009
7
5/27/2010
5.7
10/31/2011
0.51
6/3/2014
< 0.1
10/31 /2011
3,140
5/22/2012
2,280
6/15/2012 (2)
373
7/9/2012
1,730 J
8/14/2012
3,020
9/19/2012
3,190
12/5/2012
3,370
2/26/2013
2,510
5/31/2013
2,780
8/28/2013
182
11/7/2013
1,140
2/27/2014
16.6
6/2/2014 26.2 J
10/16/2014
359
4/23/2015
10/13/2015
4/29/2016
9/19/2016
3/3/2017
9/20/2017
3/1/2018
8/20/2018
PARCADIS
84,500
260,000
85,500
20,000
NE
600
600
500
20
250
Ng/I
Ng/I
Ng/I
Ng/I
mg/I
<0.5
<0.5
<1
69
<0.5
<0.5
<1
63.3
0.65J
<0.5
<1
80.6
<0.5
<0.5
<1
58.9
<0.5
<0.5
<1
17.4
<0.8
<0.7
<0.8
19
< 0.05
0.076 J
< 0.14
14.5
<0.11
<0.11
<0.32
12.4
0.161
<0.81 U
0.57J
8.9
<1
< 0.1
< 0.1
< 0.2
4.1
�998
11,100
8,950
1,140
8.2
2,790
18,200
12,000
789
<5
910
4,800
3, 910
114
10,600
2,170 J
15,000 J
9,750 J
676 J
2,300
21990
24,400
12,800
1,090
758
3,090
22,600
14,000
1,240
322
2,970
20,100
12,800
1,380
32
2,970
10,100
8,690
1,140
13.8
31070
81210
5,740
1,000
83.3
730
1,660
139
7,850
_368
727
4,910
3,250
694
2,640
109
20.2
45.8
18.5
4,310
125J
37.5J
31.6J
37.4J
388
244
138
364
1,540
780
516
79.4
377
295
257
253
173
NE
NE
mg/I
422
446
307
3,410
835
580
542
436
500
475
2,230
1,370
1,270
Page 4 of 5

Appendix C
Historical Groundwater Analytical Summary
Former BP Service Station No. 24163
381 Knollwood Street
Winston-Salem, Forsyth County, North Carolina
PARCADIS
NC GCL:
NC 2L
Units:
5,000
1
Ng/I
84,500
600
Ng/I
260,000
600
Ng/I
85,500
500
Ng/I
20,000
20
Ng/I
NE
250
mg/I
NE
NE
mg/I
10/31 /2011
2,390
1,380
8,790
7,040
5,160
3.7
425
5/22/2012
6/15/2012 (2)
7/9/2012
8/14/2012
9/19/2012
12/5/2012
2/26/2013
5/31/2013
8/28/2013
117/2013
2/27/2014
MW-19 6/2/2014
10/16/2014
4/23/2015
10/13/2015
4/28/2016
9/19/2016
3/3/2017
9/20/2017
3/1/2018
8/20/2018
3/15/2019
10/8/2019
3/25/2020
2,700
1,560
1,440
2,910
1,650
1,630
1,810
1,110
894
1,190 J
984
1,400
11260
14,200 7,940
18,200 7,940
30,400 J 16,300
14,200 8,370
12,900 8,640
15,200 10,400
10,600 6,990
8,820 5,250
13,100 7,420 J
9,850 5,620
10,900 7,880
11,900 7,260
Paved Over - Destroyed
4,880
3,290
5,330
4,090
3,960
4,010
3,890
3,120
3,240 J
2,260
3,320
2,830
< 5 310
1,090 6,520
232 991
469 1,080
260 690
58.8 588
169 503
1,530 606
2,660 525
2,890 255
2,790 322
2,340 632
2,540 514
1,960
1,780 i
1,270
941
1,020
745
806
1,150
783
4,020
2,420
2,090
2,320
2,210
1,830
2,710 J
2,020
2,550
2,370
Notes:
(1) Field duplicate
(2)Alkalinity, sulfate, and carbon dioxide samples were collected 6/14/2012 and volatile organic analysis samples were collected 6/15/12.
-" - Not sampled or analyzed
< - Not detected at the specified detection limit
pg/I - Micrograms per Liter
GCL - Gross Contamination Level
2L - North Carolina Groundwater Quality (2L) Standard
J - Estimated value
mg/I - Milligrams per Liter
MTBE - Methyl tert-Butyl Ether
NE - Not established
U - Not present above the associated level, blank contamination exists
UJ - Not detected and the detection limit is estimated
BOLD text indicates 2L exceedance
-Bold cell with green highlight indicates GCL exceedence
Activated sodium persulfate injections were performed at the site from June 4, 2012, to June 9, 2012, and from June 3, 2013, to June 6, 2013.
Page 5 of 5

ARCADIS
Arcadis U.S., Inc.
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Bluefield, Virginia 24605
Tel [phone]
Fax [phone]
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